Two-Dimensional Radiative Back-Scattering From Optically Thick Media

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Abstract
The theoretical and experimental results of anisotropic back-scattering from an optically thick medium exposed to a laser beam are presented. The laser beam is incident normal to the upper surface of the scattering medium. Uniformly sized latex particles with diameters ranging from 0.046 to 0.35 μm are used for the scattering centers in a water solution. The results are discussed for back-scattered radiation as a function of optical radius from the laser beam and optical thickness of the scattering medium. It is shown that back-scattered radiation in optically thick media is very sensitive to small changes in albedo when the albedo is near unity. The sensitivity increases as the optical radius increases. Also, the isotropic scattering solution yields good agreement with the experimental data at large optical radii when one uses effective optical properties. The agreement between theory and experiment is improved when index of refraction effects at the interface are included.

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